| 摘要 |
A synchronous tilt control mechanism is provided for a chair. The chair includes a base, a seat, a back, a torsion spring, a first slide member and a second slide member. The base further includes a tilt control housing mounted thereon. The back includes a forwardly extending support member. The seat and back are pivotally attached to the tilt control housing. The torsion spring has a forwardly extending leg and a rearwardly extending leg. The forwardly extending leg is mounted to the tilt control housing. The seat slidably engages the support member by way of the first slide member, which is disposed on one of the seat and the support member. The support member slidably engages the rearwardly extending leg of the torsion spring by way of the second slide member, which is disposed on one of the support member and rearwardly extending leg. A downward movement of the seat causes the back to move downwardly and rearwardly against an upward force provided by the torsion spring. During the downward movement, the back is moved downwardly and rearwardly at a slightly greater rate than the seat, whereby the comfort of the user is improved. A tilt limiter device is used to limit the upward tilting of the back. In a forward tilt position, the movement of the back is arrested, whereby the seat is permitted to tilt forwardly and upwardly by itself. The seat and back can also be maintained in a plurality of positions by a tilt lock device. The seat can also be maintained in a forward tilt position by a stop device. In addition, a seat adjustment device can be employed to allow for forward and rearward adjustment of the seat.
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